Uh it hasn't been confirm that I'll be a sequel buddy unless you have a source to provide to us that says it will be. Though rumors for quite awhile now have been saying that there was going to be another FMA anime and guess what it turn out to be true, also part of that rumor was that it's going to be a remake, plus adding the fact that the manga is going to end soon it adds more fuel as to this possibly is going to be a remake that follows the manga to the very end.